Support synchrony to run as a standalone service in Confluence DC on Windows

Problem Definition

Confluence Data Center requires running synchrony in a separate cluster. Synchrony is a Java application, but doesn't implement ServiceMain, so it can't be run as a Windows service natively.

Therefore, Synchrony cannot be run out of the box as a Windows service and requires manually starting and stopping via the start-synchrony.bat and stop-synchrony.bat scripts.

There is a note in Configuring Synchrony For Data Center regarding this issue:

It's currently not possible to run Synchrony as a service on Windows.

Synchrony does support running as a linux service, natively:

• Run Synchrony Standalone As A Service On Linux (for 6.5 and newer)
• Run Synchrony Standalone As A Service On Linux For Confluence 6.4 And Earlier

Suggested Solution

Provide out-of-the-box ability to run Synchrony as a Windows service for Enterprise customers.

Why this is important

1. Enterprise customers cannot rely on manually running scripts or developing their own service scripts to run Synchrony.
2. Windows is a supported platform for Confluence Data Center.

Workaround

1. Run just Synchrony on a linux node (assuming the rest of the cluster is on Windows) using the instructions linked above.
2. Use 3rd party tools to run Synchrony on Windows